Automatic variable-speed gear



May 27, 1930. E. JANIK AUTOMATIC VARIABLE 'SPEED GEAR Filed Feb. 20.1929 4 IIIIIIIIIIA Patented .May 27, 1930 nnuaan JANIK', or VIENNA,Ausrnm PATEN;

ore-lea AUTOMATIC VARIABLE-SPEED GEA-R Application filed February 20,1929, Serial No. 341,445, and in Austria February 27, 1928.

This invention relates to an automatic variable speed gear wherein thepower'is transmitted by a crank, the length of the crank arm beingautomatically increased as the load decreases and automatically de'-,

creased as the load increases.

The invention is illustrated in the annexed drawing in which Figs. 1 and3 show plan views of two difierent constructional forms of theinvention; Fig. 2 shows a detail.

On the driving shaft a a frame I) is secured carrying a screw 0, (l. Themovable sliding block constitutes the crank arm. The screw 9 carries atoothed or frictional gear e cooperating with a couple of toothed orfrictional wheels h 2' connected b a yoke B to form a unit secured torods and movable'with them axially. i The transmission of power from thedriving shaft (1 to the driven shaft '10 is effected by a link nthroughthe medium of any one vvlayfit clutch wheel 0 mounted on thedriven s a The rods D together with the yoke B are actuated in anydesired manner by centrifugal force operating the' governor M mounted onthe driven shaft w. In the example shown this is done by the leversKpivoted in the frame at N.

On the rods Dare arranged two slidable sleeves G-with friction-jaws orblocks H, Fig. 2, which are forced against the rods D by screws andsprings in such a manner, that the sleeves can move along the rods onlywith a certain degreeof friction. The sleeves G move the rods D and theyoke B in either direction whereby the wheels 71. or i-arebrought intoengagement with the wheel 6 on the one or the other side thereof. a

The movement of the yoke B required for causing the wheels k or z toengage with the wheel e is limited, whereas the length of the stroke ofthe levers K may vary and is dependent of the varying centrifugal forceex-, erted by the governor M.. The levers K move the yoke B into eitherof the operative positions by means of the friction sleeves G whereuponthe yoke and the sleeves are stopped until the actuation of the sleevesby the governor ceases or is reversed.

I vehicle motor starting on a horizontal road,

actuating a sliding block the decrease of the centrifugal force, thegov- Before starting the sleeve of the governor M is in its extremeright hand position and the crank arm is at its minimum length.

If now, owing to the rotation of the shaft w, the sleeve of the governorM begins to move to the left, the wheel It comes into engagement withthe Wheel e whereby the length of the crank arm is increased and maysoon reach its maximum as in the case of a while starting upwards on anincline the crank arm will be lengthened too rapidly w and the number ofrevolutions of the driven shaft will soon decrease whereby, owing toernor will cause the wheel 21 to engage with the wheel e, so that thecrank arm shortens.

Thereby the number of revolutions of the driven shaft w increases andthe sleeve of the governor M moves to the left tending to bringthe wheelit into engagement with the wheel e and so on. Thus the variable speedgear always tends to bring about the most favorable transmission ofpower. In the constructional form shown in Fig. 3 the levers K andsleeves G are dispensed with and the yoke .13 is directly actuated bythe sleeve of the governor and the rods D.-

VVhat I claim is: 1. In an automatic variable speed gear the 8pcombination of a driving shaft, a frame fast on such drivin' shaft, ascrew, revolubly mounted in suc frame, a nut mounted on such screw and acrank pin secured to such nut, a wheel fast on the said screw, twoactuating wheels located on opposite sides of the wheel on the screw,the planes of such actuating wheels being parallel to each other andperpendicular to the plane of the screw Wheel and the said actuatingwheels being adapted to engage alternatively therewith, such actuatingwheels being slidingly mounted on the said frame, a driven shaftsubstantially coclutch wheel, a centrifugal governor mounted on thesaiddriven shaft and comprising a sleeve slidably mounted -on -such shaftand 9-? means for operatively connecting the said sleeve to the abovesaid actuating wheels.

2. Iii an automatic variable speed gear the combination of a drivingshaft, a frame fast on such driving shaft, a screw revolubly mounted insuch frame, a nut'mounted on such screw and a crank pin secured to suchnut, a wheel fast on the said screw, two actuating wheels located onopposite sides of the Wheel on the screw, the planes of such "actuatingwheels being parallel to each other and perpendicular to the plane ofthe screw wheel and the said actuating wheels being adapted to engagealternatively therewith, such actuating wheels being slidingly mountedon the said frame, a yoke rigidly connecting the said actuating wheels,a driven shaft substantially coaxial with the driving shaft, a one wayclutch'wheel secured to such driven shaft,

means operatively connected to the said crank pin for intermittentlymoving the said one way clutch wheel, a centrifugal governor mounted onthe saiddriven shaft and comprising a sleeve slidably mounted on suchshaft and means for operatively connecting the said sleeve to'the abovesaid actuating wheels.

In testimony whereof I have afiixed my signature.

' EDUARD JANIK.

